Waning effectiveness of BNT162b2 and ChAdOx1 COVID-19 vaccines over six months since second dose: a cohort study using linked electronic health records
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author: Ben Goldacre, Elizabeth Williamson, Tom Palmer, Miguel Hernán, Jonathan Sterne, Helen J Curtis, Lisa E M Hopcroft, William Hulme, Brian MacKenna, David Evans, Alex J Walker, Richard Croker, Edward P.K. Parker, Amelia Green, George Hickman, Ruth Keogh, Elsie M. F. Horne, Seb Bacon, Jessica Morley, Caroline E Morton
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